CAJ | 학술논문

以纯硅介孔分子筛KIT-1为载体,钛酸四丁酯为钛源,分别采用浸渍法、接枝法、胶体法3种后合成法合成了含钛介孔分子筛Ti-KIT-1.利用FT IR、DRS、XRD、N_2吸附-脱附等温线、化学分析法等手段对样品进行了表征,并在温和条件下考察了Ti-KIT-1对苯羟化反应的催化性能.实验结果表明:Ti-KIT-1仍保持完好的介孔结构,但其比表面积、孔容有所降低.3种后合成法合成的钛硅分子筛骨架中存在四配位钛,且以接枝法样品中钛的掺杂量最多,表现出比其他两种样品更好的催化活性.
이순규개공분자사KIT-1위재체,태산사정지위태원,분별채용침지법、접지법、효체법3충후합성법합성료함태개공분자사Ti-KIT-1.이용FT IR、DRS、XRD、N_2흡부-탈부등온선、화학분석법등수단대양품진행료표정,병재온화조건하고찰료Ti-KIT-1대분간화반응적최화성능.실험결과표명:Ti-KIT-1잉보지완호적개공결구,단기비표면적、공용유소강저.3충후합성법합성적태규분자사골가중존재사배위태,차이접지법양품중태적참잡량최다,표현출비기타량충양품경호적최화활성.
Mesoporous molecular sieve Ti-KIT-1 samples were prepared by three different post-synthetic methods using Ti(OEt)_4 as the Ti source and KIT-1 as the support. The three post-synthetic methods were impregnation method, grafting method and colloidal method. The Ti-KIT-1 samples were characterized by FT IR, DRS, XRD, chemical analysis and physical adsorption-desorption of nitrogen. The catalytic performance of the Ti-KIT-1 samples for hydroxylation of benzene reaction was tested under mild conditions. Experimental results showed that the Ti-KIT-1 samples kept the original mesoporous structure with a smaller specific BET surface area compared to the parent KIT-1 sieve. DRS and FT IR indicated the existence of tetrahedral titanium (IV), and chemical analysis proved that the weight percentage of TiO_2 in the grafting sample was greater than that of the impregnated and colloidal samples, and the former showed superior catalytic activity.